JPH0237221Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Industrial application field] This invention relates to bus ducts used for electrical main lines in buildings, factories, etc. This invention relates to opening/closing devices for openings such as connection openings.

[Prior art] The bus duct BD' shown in FIG. 6 has upper and lower plates a1 and a.
Metal duct consisting of 2 and both side plates b1 and b2
H', bus bar B' is insulating material holder S1, S1
It is supported and stored. Such a bus duct is provided with a plug-in opening 1' in the upper plate a1 and/or the lower plate a2 for attaching a plug-in device for branching. This plug-in opening 1' is covered with a cover 4' to prevent the ingress of dust until the branching plug-in device is installed.
is installed.

Conventionally, the above-mentioned cover 4' is attached to the upper surface of the plug-in opening 1', as shown in the sixth illustrated example.
The cover 4' is large enough to cover the plug-in opening 1' and has an upper surface part 41 having a size that is approximately the same as the duct width.
and protrusions 43, 43 that lock onto the bent end of the duct.
It consists of both side parts 42, 42 which have. When the edges of both side surfaces 42, 42 of the cover 4' are press-fitted into the outside of the duct H' from the upper part of the plug-in opening 1', the convex parts 43, 43 will fit into the bent end a1 of the duct H'. ', a1', and is clamped and supported by the elasticity of the cover 4' itself.

When opening the plug-in opening 1', slide the cover 4' in the longitudinal direction of the duct or pull up the edge of the cover side part 42 to open the duct.
Remove from H′.

[Problems to be solved by the invention] The above-mentioned conventional cover is located on the top surface of the duct opening, and is attached by clamping to the duct, so it is difficult to handle the load due to the bus duct loading or transportation. If the cover is subjected to vibrations or shocks inside, the top surface of the cover may warp or the clamping force of both side surfaces to the duct may decrease. Therefore, there is a risk that the cover may shift in the longitudinal direction of the duct or fall during bus duct construction. Furthermore, since the cover is designed to be easily removed without using tools, there is a risk of it being lost.

The present invention is an improvement to eliminate the above-mentioned drawbacks.

B. Structure of the invention [Means for solving the problem] The present invention forms cutout grooves at opposing positions on the front and rear end faces of the duct in the longitudinal direction of the opening of the bus duct in which the bus bar is housed in the duct. , a plate member having a size that covers the opening and the notched groove and is slidable in the longitudinal direction of the duct is disposed on the inner surface of the opening, a stopper that can be tightened and loosened is provided on the upper surface of the plate member, and the plate By sliding the shaped member and engaging the stopper with the notch groove in the front or rear part,
This is an opening/closing device for a bus duct characterized by opening and closing an opening.

[Function] The plate member covering the opening is located on the inner surface of the opening, so even when the bus duct is loaded,
The plate-like member does not receive the load, and there is no risk of it deforming or warping.

Since the plate-like member is tightened by the stopper that engages with the notched groove in the open position and the closed position of the opening, there is no risk of it shifting or falling.

[Example] Fig. 1 is a partially cutaway front view showing an example of the bus duct opening/closing device of the present invention, Fig. 2 is a plan view showing the opening in a closed state, and Fig. 3 is the opening. FIG. 4 is an exploded perspective view of the opening/closing device.

In the figure, BD is a bus duct, and a duct H is constructed by overlapping concave and convex surfaces c and d, which are formed similarly in the longitudinal direction of the mouth edges on both sides of two channel members a and b. A bus bar B is placed between two insulating supports S. Reference numeral 1 denotes a plug-in opening provided on the upper surface of the duct H, and cutout grooves 2,
3 is formed. Reference numeral 4 denotes a plate-shaped member disposed on the inner surface of the opening 1, and its bent portions 4a and 4b on both sides thereof are engaged with the recessed portions e and f on both sides of the duct H, and is slidable in the longitudinal direction of the duct. The member 4 has a size that covers the opening 1 and the notched grooves 2 and 3.

At a position where the plate member closes the opening 1 and the notched grooves 2 and 3, a screw hole 5 is provided in the plate member 4 at the location of the notched groove 2, and a screw 6 is attached to the hole 5. Make sure that screw 6 does not come off.
It is possible to prevent the plate member 4 from coming off by crushing the tip of the threaded portion protruding from the inner surface side.

When the screw 6 is tightened in the above condition, the plate-like member 4
is fixed to the duct H at the notched groove 2 (state shown in the second figure).

When opening opening 1 of duct H, screw 6
loosen and slide the plate member 4 in the longitudinal direction of the duct,
The screw 6 is engaged with the notched groove 3 located at the rear edge of the opening 1. As a result, the opening 1 becomes open, and the plate member 4 is fixed to the duct H by tightening the screw 6 (the state shown in the third figure).

Note that the shape of the plate-like member 4 and the means for providing the member 4 so as to be slidable in the longitudinal direction of the duct may vary depending on the configuration of the duct, and FIG.
An example in which parts of both sides of the duct H2 are cut and raised relatively inward, and the cut and raised pieces 7 and 7 are used as guide rails for _the flat plate member ₄₁ . This is an example in which a plate member ₄₂ having a U-shaped cross section is used as a guide rail.

Notched grooves 2 and 3 provided on the front and rear end surfaces of the opening 1
may be provided at opposite positions in the longitudinal direction of the duct, and are not limited to the central position in the width direction of the duct as shown, but may be provided at positions shifted left and right. Further, the notch depths of the grooves 2 and 3 do not necessarily have to be the same.

Further, although the illustrated example shows a plug-in opening,
Feed-in opening for connecting other power sources,
It can also be used in switching devices such as duct interconnection openings.

C. Effect Since the bus duct opening/closing device of the present invention has the above-mentioned configuration, the plate-like member covering the opening is located on the inner surface of the opening, so even when the bus duct is loaded, the plate-like member It does not receive that load and there is no risk of it deforming or warping.

Since the plate-like member is tightened by the stopper that engages with the notched groove in the open position and the closed position of the opening, there is no risk of it shifting or falling.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an example of the bus duct opening/closing device of the present invention, Fig. 2 is a plan view showing the opening closed, and Fig. 3 shows the opening opened. 4 is an exploded perspective view of the opening/closing device, FIG. 5 is a front view showing another example of the present invention, and FIG. 6 is a perspective view showing a conventional bus duct opening cover device. 1 is an opening, 2 and 3 are notched grooves, 4, 4 ₁ , 4 ₂
is a plate member, 6 is a stopper, BD is a bus duct,
H, H ₁ and H ₂ are ducts.

Claims (1)

[Scope of utility model registration request] At the opening of the bus duct in which the bus bar is housed in the duct, cutout grooves are formed at opposing positions on the front and rear end faces of the duct in the longitudinal direction of the opening, and a groove is slidable in the longitudinal direction of the duct with a size that covers the opening and the notch groove. A movable plate-like member is arranged on the inner surface of the opening, a stopper that can be tightened and loosened is provided on the upper surface of the plate-like member, and the stopper is inserted into the notch groove in the front or rear part by sliding the plate-like member. An opening/closing device for a bus duct, characterized in that the opening/closing device opens/closes the opening by engaging the device.